So I have a 1987 Johnson 30hp outboard. I need to put a new water pump in it but I have hit a road block. I already have the gear case off. The problem is on the shift shaft. There is a brass bushing which I cannot figure out how to get off to remove the old water pump. The shift shaft is slightly corroded around the bushing. Should the bushing just slide off or am I missing a step or two?